GTB Legacy - Check Light and Engine cutting

[bmc]

Hi all,

Drove my legacy home today all good.

I then get back in it to go for a drive a couple of hours later and I realise the engine check light is on. :-\

The car drives fine, but once you accelerate moderately with a little force, the car will start moving well and then reach a point when the engine or turbo cuts out like a surge or jolt. You can cruise along on the motor way or the streets fine, its when you apply a little bit of acceleration with very minor force this fault occurs.

Any ideas? - have never experienced this before.

[Guest]

Will be hitting limp mode my guess. Happens when your cel is on. Check codes that will point you to your problem.

Btw CEL means dont drive your car work out wtf is wrong with it.

[bmc]

Ok - have run the CEL codes, but have not re-set the ecu as yet.

I have:

23 - air flow sensor? - Open or Short . This one could be historic as it appears my air flow unit has been reconditioned sometime ago and also appears first.

66 - Sequential turbo system - No rise in pressure or pressure excessive (Over boost)

In english what does this mean?

[Guest]

I would be borrowing a known good afm and resetting and trying other afm. Might fix other code. Someone at the next meet would be a good bet to borrow.

[Marky]

afm is a very common fault, and code 66 is a mofo - can mean half a dozen things but none terminal

do you have a boost gauge - what is it running?

Code 66 is from boost falling outside of what is expected - either not making enough, or making too much, it can also pick up a fault in the tt switching bits as part of this - if its really low, it can pick up an air leak as a "turbo problem" too

[bmc]

Sorry,no boost gauge but would assume standard boost being run subject to this fault.

AFM fault - does this simply sound like I need a new AFM

Re 66 - I suppose I will just need to take it to a mechanic and hope he knows what he is doing. At least I won\'t be paying for a diagnostics check.

I am just hoping its not a blown turbo or something expensive. I have just spent over $2.5k getting my honda head being re-built as of last week due to a engine check light fault and running rough at idle.

[Rosssub]

http://www.uklegacy.com/forums/index.php?showtopic=11043

[Marky]

To me it does sound like an AFM fault. Some people will go years without ever having one fault - one of my previous cars ate them regularly (did 3 in a year!) - the symptoms you are describing sound like normal AFM issues.

The code 66 could be related to this as well - it could well be "under boosting" due to bung AFM and triggering a code 66 as well.

Try AFM first, do an ECU reset (just whip the battery terminal off for a minute or three, or there\'s a way to do it with the diagnostic plugs - I\'m too gammy to bother with that) and clear both codes, some people will trigger a 66 every now and then and just do a reset to clear it. It\'s not the end of the world by any stretch, and is so vague that to be honest I wouldn\'t go paying someone to look into it unless it was a daily / weekly occurence.

Might not hurt to borrow a boost gauge just to check nothing untoward going on there though

[tebbyj]

 Rosssub said:

http://www.uklegacy.com/forums/index.php?showtopic=11043

Good write up this...

Start with the AFM, can cause strange symptoms and even trigger other codes.

Also check for vacuum leaks or any hoses that may have split.

[bmc]

Weird thing - I start the car this morning with no problems, no check light and has been fine all day - thus far!

[Codex]

Cleaning out BBOD cleared my 66, was getting it at high second turbo.

I agree with marky though, afm first